Updated on 2024/10/07

写真a

 
SATO Yutaro
 
Organization
Academic Assembly Institute of Science and Technology Fundamental Sciences Assistant Professor
Graduate School of Science and Technology Fundamental Sciences Assistant Professor
Faculty of Science Department of Science Assistant Professor
Title
Assistant Professor
External link

Degree

  • 博士(理学) ( 2013.3 )

  • 修士(理学) ( 2010.3 )

Research Interests

  • Belle

  • g-2/EDM

  • B中間子

  • J-PARC

  • シリコン検出器

  • ミューオン

  • 素粒子実験

  • 素粒子物理学

Research History

  • Niigata University   Fundamental Sciences, Institute of Science and Technology, Academic Assembly   Assistant Professor

    2021.4

  • Niigata University   Department of Science, Faculty of Science   Assistant Professor

    2021.4

  • Niigata University   Fundamental Sciences, Graduate School of Science and Technology   Assistant Professor

    2021.4

 

Papers

  • Silicon Strip Detector for Muon g-2/EDM Experiment at J-PARC Reviewed

    Shinji Ogawa, Takahiro Ushizawa, Keisuke Umebayashi, Yuuta Okazaki, Tatsuya Kume, Shota Kurumida, Naohito Saito, Nobuhiko Sato, Yutaro Sato, Junichi Suzuki, Yoshiaki Seino, Toshikazu Takatomi, Junji Tojo, Tsutomu Mibe, Hiroshi Yamaoka, Takashi Yamanaka, Tamaki Yoshioka

    Proceedings of the 31st International Workshop on Vertex Detectors (VERTEX2022)   2024.6

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    Publishing type：Research paper (international conference proceedings)   Publisher：Journal of the Physical Society of Japan  

    DOI： 10.7566/jpscp.42.011008

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  • Precise control of a strong X-Y coupling beam transportation for J-PARC muon g-2/EDM experiment Reviewed

    Hiromi Iinuma, Mitsushi Abe, Ken’ichi Sasaki, Hisayoshi Nakayama, Tsutomu Mibe, Shinji Ogawa, Takashi Yamanaka, Yutaro Sato

    Journal of Physics: Conference Series   2687 ( 2 )   022034 - 022034   2024.1

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    Publishing type：Research paper (international conference proceedings)   Publisher：IOP Publishing  

    Abstract

    A strategy for designing a dedicated beam injection and storage scheme for the J-PARC Muon g-2/EDM experiment is described. To accomplish a three-dimensional beam injection into the MRI-type compact storage system, transverse beam phase spaces (X-Y coupling) and a pulsed kicker system are key to controlling the vertical motion inside the storage volume. Moreover, dedicated beam phase control through the beam channel of the storage magnet’s yoke is crucial. We introduce a five-dimensional phase-space correlation in addition to strong X-Y coupling to control the stored vertical beam size to a level as small as one-third that achievable by X-Y coupling alone.

    DOI： 10.1088/1742-6596/2687/2/022034

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    Other Link： https://iopscience.iop.org/article/10.1088/1742-6596/2687/2/022034/pdf

  • END-TO-END SIMULATIONS AND ERROR STUDIES OF THE J-PARC MUON LINAC

    Y. Takeuchi, J. Tojo, T. Yamanaka, Y. Nakazawa, H. Iinuma, Y. Kondo, R. Kitamura, T. Morishita, E. Cicek, H. Ego, K. Futatsukawa, N. Kawamura, M. Otani, T. Yamazaki, M. Yoshida, T. Mibe, N. Saito, Y. Iwashita, Y. Sue, K. Sumi, M. Yotsuzuka, Y. Sato, H. Yasuda

    Proceedings - Linear Accelerator Conference, LINAC   563 - 565   2022

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    Publishing type：Research paper (international conference proceedings)  

    A muon linac is under development for future muon g-2/EDM experiments at J-PARC. The linac provides a 212 MeV muon beam to an MRI-type compact storage ring. After the initial acceleration using the electrostatic field created by mesh and cylindrical electrodes, the muons are accelerated using four types of radio-frequency accelerators. To validate the linac design as a whole, end-to-end simulations were performed using General Particle Tracer. In addition, error studies is ongoing to investigate the effects on beam and spin dynamics of various errors in the accelerator components and input beam distribution. This paper describes the preliminary results of the end-to-end simulations and error studies.

    DOI： 10.18429/JACoW-LINAC2022-TUPORI08

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  • Rabi-oscillation spectroscopy of the hyperfine structure of muonium atoms Reviewed

    S. Nishimura, H. A. Torii, Y. Fukao, T. U. Ito, M. Iwasaki, S. Kanda, K. Kawagoe, D. Kawall, N. Kawamura, N. Kurosawa, Y. Matsuda, T. Mibe, Y. Miyake, N. Saito, K. Sasaki, Y. Sato, S. Seo, P. Strasser, T. Suehara, K. S. Tanaka, T. Tanaka, J. Tojo, A. Toyoda, Y. Ueno, T. Yamanaka, T. Yamazaki, H. Yasuda, T. Yoshioka, K. Shimomura

    Physical Review A   104 ( 2 )   2021.8

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    Publishing type：Research paper (scientific journal)   Publisher：American Physical Society (APS)  

    DOI： 10.1103/physreva.104.l020801

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    Other Link： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevA.104.L020801/fulltext

  • Development of Pulsed Beam System for the Three Dimensional Spiral Injection Scheme in the J-PARC muon g-2/EDM Experiment

    Ryota Matsushita, Mitsushi Abe, Honoka Hirayama, Kazuro Hurukawa, Hiromi Iinuma, Tsutomu Mibe, Hisayoshi Nakayama, Kodai Oda, Satoshi Ohsawa, Muhammad Abdul Rehman, Naohito Saito, Ken-ichi Sasaki, Yutaro Sato, Moe Sugita, Tomohiro Takayanagi

    Joint Accelerator Conferences Website   IPAC2021 ( MOPAB256 )   809 - 812   2021.8

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  • Developments of a Pulse Kicker System for the Three-Dimensional Spiral Beam Injection of the J-PARC Muon g-2/EDM Experiment

    Kodai Oda, Mitsushi Abe, Kazuro Furukawa, Honoka Hirayama, Hiromi Iinuma, Ryota Matsushita, Tsutomu Mibe, Hisayoshi Nakayama, Satoshi Ohsawa, Muhammad Abdul Rehman, Naohito Saito, Ken-ichi Sasaki, Yutaro Sato, Moe Sugita

    Joint Accelerator Conferences Website   IPAC2021   726 - 729   2021.8

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    Publishing type：Research paper (international conference proceedings)  

    DOI： 10.18429/JACoW-IPAC2021-MOPAB221

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  • New precise spectroscopy of the hyperfine structure in muonium with a high-intensity pulsed muon beam Reviewed

    S. Kanda, Y. Fukao, Y. Ikedo, K. Ishida, M. Iwasaki, D. Kawall, N. Kawamura, K.M. Kojima, N. Kurosawa, Y. Matsuda, T. Mibe, Y. Miyake, S. Nishimura, N. Saito, Y. Sato, S. Seo, K. Shimomura, P. Strasser, K.S. Tanaka, T. Tanaka, H.A. Torii, A. Toyoda, Y. Ueno

    Physics Letters B   815   136154 - 136154   2021.4

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.physletb.2021.136154

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  • J-PARC Muon <i>g</i> − 2/EDM Experiment Reviewed

    Yutaro Sato

    Proceedings of the 3rd J-PARC Symposium (J-PARC2019)   2021.3

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    Publishing type：Research paper (international conference proceedings)   Publisher：Journal of the Physical Society of Japan  

    DOI： 10.7566/jpscp.33.011110

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  • Study of muonium emission from laser-ablated silica aerogel Reviewed

    J Beare, G Beer, J H Brewer, T Iijima, K Ishida, M Iwasaki, S Kamal, K Kanamori, N Kawamura, R Kitamura, S Li, G M Luke, G M Marshall, T Mibe, Y Miyake, Y Oishi, K Olchanski, A Olin, M Otani, M A Rehman, N Saito, Y Sato, K Shimomura, K Suzuki, M Tabata, H Yasuda

    Progress of Theoretical and Experimental Physics   2020 ( 12 )   2020.12

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    Publishing type：Research paper (scientific journal)   Publisher：Oxford University Press (OUP)  

    <title>Abstract</title>
    The emission of muonium ($\mu^+e^-$) atoms into vacuum from silica aerogel with laser ablation on its surface was studied with various ablation structures at room temperature using the subsurface muon beams at TRIUMF and Japan Proton Accelerator Research Complex (J-PARC). Laser ablation was applied to produce holes or grooves with typical dimensions of a few hundred $\mu$m to a few mm, except for some extreme conditions. The measured emission rate tends to be higher for larger fractions of ablation opening and for shallower depths. More than a few ablation structures reach the emission rates similar to the highest achieved in past measurements. The emission rate is found to be stable at least for a couple of days. Measurements of spin precession amplitudes for the produced muonium atoms and remaining muons in a magnetic field determine a muonium formation fraction of $(65.5 \pm 1.8)$%. The precession of the polarized muonium atoms is also observed clearly in vacuum. A projection of the emission rates measured at TRIUMF to the corresponding rates at J-PARC is demonstrated taking the different beam condition into account reasonably.

    DOI： 10.1093/ptep/ptaa145

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    Other Link： http://academic.oup.com/ptep/article-pdf/2020/12/123C01/36262404/ptaa145.pdf

  • SliT: A Strip-Sensor Readout Chip With Subnanosecond Time Walk for the J-PARC Muon g-2/EDM Experiment Reviewed

    Tetsuichi Kishishita, Yutaro Sato, Yoichi Fujita, Eitaro Hamada, Tsutomu Mibe, Tsubasa Nagasawa, Shohei Shirabe, Masayoshi Shoji, Taikan Suehara, Manobu M. Tanaka, Junji Tojo, Yuki Tsutumi, Takashi Yamanaka, Tamaki Yoshioka

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   67 ( 9 )   2089 - 2095   2020.9

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    A new silicon-strip readout chip named "SliT" has been developed for the measurement of the muon anomalous magnetic moment and electric dipole moment (EDM) of the muon at Japan Proton Accelerator Research Complex (J-PARC). The SliT chip is designed in the Silterra 180-nm CMOS technology with mixed-signal integrated circuits. An analog circuit incorporates a conventional charge-sensitive amplifier, shaping amplifiers, and two distinct discriminators for each of the 128 identical channels. A digital part includes storage memories, an event building block, a serializer, and low voltage differential signaling (LVDS) drivers. A distinct feature of the SliT is utilization of the zero-crossing architecture, which consists of a CR-RC filter followed by a CR circuit as a voltage differentiator. This architecture allows generating hit signals with subnanosecond amplitude-independent time walk, which is the primary requirement for the experiment. The test results show a time walk of 0.38 +/- 0.16 ns between 0.5 and 3 MIP signals. The equivalent noise charge is 1547 +/- 75 e(-) (rms) at C-det = 33 pF as a strip-sensor capacitance. SliT128C satisfies all requirements of the J-PARC muon g - 2/EDM experiment.

    DOI： 10.1109/TNS.2020.3012924

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  • Development of a front-end ASIC for silicon -strip detectors of the J-PARC muon g-2 /EDM experiment Reviewed

    Yutaro Sato, Yowichi Fujita, Eitaro Hamada, Tetsuichi Kishishita, Tsutomu Mibe, Osamu Sasaki, Masayoshi Shoji, Taikan Suehara, Manobu Tanaka, Junji Tojo, Tuki Tsutsumi, Takashi Yamanaka, Tamaki Yoshioka

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   969   2020.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

    DOI： 10.1016/j.nima.2020.164035

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  • Performance evaluation of a silicon strip detector for positrons/electrons from a pulsed a muon beam

    T. Aoyagi, Y. Honda, H. Ikeda, M. Ikeno, K. Kawagoe, T. Kohriki, T. Kume, T. Mibe, K. Namba, S. Nishimura, N. Saito, O. Sasaki, N. Sato, Y. Sato, H. Sendai, K. Shimomura, S. Shirabe, M. Shoji, T. Suda, T. Suehara, T. Takatomi, M. Tanaka, J. Tojo, K. Tsukada, T. Uchida, T. Ushizawa, H. Wauke, T. Yamanaka, T. Yoshioka

    Journal of Instrumentation   15 ( 4 )   2020.4

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    Publishing type：Research paper (scientific journal)  

    A high-intensity pulsed muon beam is becoming available at the at the Japan Proton Accelerator Research Complex (J-PARC). Many experiments to study fundamental physics using this high-intensity muon beam are proposed. An experiment to measure the muon magnetic moment anomaly (g-2) and the muon electric dipole moment (EDM) is one of these experiments and it requires a tracking detector for positrons from muon decay. Fine segmentation is required in a detector to tolerate the high rate of positrons. The time resolution is required to be much better than the muon anomalous spin precession period while a buffer depth of a front-end electronics needs to be much longer than the accelerated muon lifetime. Requirements of this detector also meet requirements of a measurement of the muonium hyperfine structure interval at the J-PARC and another experiment to measure the proton charge radius at Tohoku University. We have developed a single-sided silicon strip sensor with a 190 μm pitch, a front-end electronics with a sampling rate of 200 MHz and a buffer memory depth of 8192, and a data acquisition system based on DAQ-Middleware for the J-PARC muon g-2/EDM experiment. We have fabricated detector modules consisting of this sensor and the front-end electronics. Performance of fabricated detector modules was evaluated at a laboratory and a beam test using the positron beam at Tohoku University. The detector is confirmed to satisfy all requirements of the experiments except for the time walk, which will be solved by the next version of a front-end electronics.

    DOI： 10.1088/1748-0221/15/04/P04027

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  • New Precision Measurement of Muonium Hyperfine Structure

    Yasuhiro Ueno, Yasuyuki Matsuda, Shun Seo, Toya Tanaka, Hiroyuki A. Torii, Daisuke Yagi, Hiromasa Yasuda, Shoichiro Nishimura, Ken'ichi Sasaki, Yutaro Sato, Koichiro Shimomura, Patrick Strasser, Hiroshi Yamaguchi, Sohtaro Kanda, Kazuo S. Tanaka, Takashi YAMANAKA

    Proceedings of The 39th International Conference on High Energy Physics — PoS(ICHEP2018)   2019.8

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    Publishing type：Research paper (international conference proceedings)   Publisher：Sissa Medialab  

    DOI： 10.22323/1.340.0466

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  • A new approach for measuring the muon anomalous magnetic moment and electric dipole moment Reviewed

    M. Abe, S. Bae, G. Beer, G. Bunce, H. Choi, S. Choi, M. Chung, W. Da Silva, S. Eidelman, M. Finger, Y. Fukao, T. Fukuyama, S. Haciomeroglu, K. Hasegawa, K. Hayasaka, N. Hayashizaki, H. Hisamatsu, T. Iijima, H. Iinuma, H. Ikeda, M. Ikeno, K. Inami, K. Ishida, T. Itahashi, M. Iwasaki, Y. Iwashita, Y. Iwata, R. Kadono, S. Kamal, T. Kamitani, S. Kanda, F. Kapusta, K. Kawagoe, N. Kawamura, B. Kim, Y. Kim, T. Kishishita, R. Kitamura, H. Ko, T. Kohriki, Y. Kondo, T. Kume, M. J. Lee, S. Lee, W. Lee, G. M. Marshall, Y. Matsuda, T. Mibe, Y. Miyake, T. Murakami, K. Nagamine, H. Nakayama, S. Nishimura, D. Nomura, T. Ogitsu, S. Ohsawa, K. Oide, Y. Oishi, S. Okada, A. Olin, Z. Omarov, M. Otani, G. Razuvaev, A. Rehman, N. Saito, N. F. Saito, K. Sasaki, O. Sasaki, N. Sato, Y. Sato, Y. K. Semertzidis, H. Sendai, Y. Shatunov, K. Shimomura, M. Shoji, B. Shwartz, P. Strasser, Y. Sue, T. Suehara, C. Sung, K. Suzuki, T. Takatomi, M. Tanaka, J. Tojo, Y. Tsutsumi, T. Uchida, K. Ueno, S. Wada, E. Won, H. Yamaguchi, T. Yamanaka, A. Yamamoto, T. Yamazaki, H. Yasuda, M. Yoshida, T. Yoshioka

    Progress of Theoretical and Experimental Physics   2019 ( 5 )   2019.5

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    © 2019 The Author(s). This paper introduces a new approach to measure the muon magnetic moment anomaly aμ = (g - 2)/2 and the muon electric dipole moment (EDM) dμ at the J-PARC muon facility. The goal of our experiment is to measure aμ and dμ using an independent method with a factor of 10 lower muon momentum, and a factor of 20 smaller diameter storage-ring solenoid compared with previous and ongoing muon g - 2 experiments with unprecedented quality of the storage magnetic field. Additional significant differences from the present experimental method include a factor of 1000 smaller transverse emittance of the muon beam (reaccelerated thermal muon beam), its efficient vertical injection into the solenoid, and tracking each decay positron from muon decay to obtain its momentum vector. The precision goal for aμ is a statistical uncertainty of 450 parts per billion (ppb), similar to the present experimental uncertainty, and a systematic uncertainty less than 70 ppb. The goal for EDM is a sensitivity of 1.5 × 10-21 ecm.

    DOI： 10.1093/ptep/ptz030

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  • Prototype Front-end ASIC for Silicon-strip Detectors of J-PARC Muon g-2/EDM Experiment

    Yuki Tsutsumi, Tetsuichi Kishishita, Yutaro Sato, Masayoshi Shoji, Manobu M. Tanaka, Tsutomu Mibe, Junji Tojo

    Proceedings of Science   343   2019.1

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    Publishing type：Research paper (international conference proceedings)  

    We report on the development of a front-end ASIC for silicon-strip detectors
    of the J-PARC Muon g-2/EDM experiment. This experiment aims to measure the muon
    anomalous magnetic moment and electric dipole moment precisely to explore new
    physics beyond the Standard Model. Since the time and momentum of positrons
    from muon decay are key information in the experiment, a fast response with
    high granularity is demanded to silicon-strip detectors as the positron
    tracker. The readout ASIC is thus required to tolerate a high hit rate of 1.4
    MHz per strip and to have deep memory for the period of 40 us with 5 ns time
    resolution. To satisfy the experimental requirements, an analog prototype ASIC
    was newly designed with the Silterra 180 nm CMOS technology. In the evaluation
    test, the time-walk was demonstrated to reach 0.8~ns with a sufficient dynamic
    range of 6~MIPs and pulse width of 45~ns for 1 MIP event. The design details
    and performance of the ASIC are discussed in this article.

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    Other Link： http://arxiv.org/pdf/1901.10181v1

  • Development of silicon strip detector for J-PARC muon g-2/EDM experiment

    Yutaro Sato, Masahiro Ikeno, Tetsuichi Kishishita, Takashi Kohriki, Tatsuya Kume, Tsutomu Mibe, Takeshi Murakami, Naohito Saito, Osamu Sasaki, Nobuhiko Sato, Hiroshi Sendai, Masayoshi Shoji, Toshikazu Takatomi, Manobu Tanaka, Tomohisa Uchida, Kazuki Ueno, Hirokazu Ikeda, Takumi Ito, Kiyotomo Kawagoe, Masato Matama, Shohei Shirabe, Taikan Suehara, Junji Tojo, Yuki Tsutsumi, Takashi Yamanaka, Tamaki Yoshioka, Shoichiro Nishimura, Hiromasa Yasuda

    Proceedings of Science   340   2019

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    Publishing type：Research paper (international conference proceedings)  

    The muon anomalous magnetic moment (g−2) and electric dipole moment (EDM) are sensitive to new physics beyond the Standard Model. We aim to measure (g−2) with a precision of 0.1 parts per million and search for EDM with a sensitivity of 10 e·cm at J-PARC. In this experiment, we use a silicon strip detector with high granularity and fast response to detect positrons from muon decay. We report on the development status of the silicon strip detector. µ µ − 21

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  • Performance of Front-end ASIC and its evaluation with Silicon Strip Sensor for J-PARC Muon g-2/EDM Experiment Reviewed

    Y. Sato, H. Ikeda, M. Ikeno, T. Ito, K. Kawagoe, T. Kishishita, T. Kohriki, T. Kume, M. Matama, T. Mibe, T. Murakami, T. Nagasawa, S. Nishimura, N. Saito, O. Sasaki, S. Shirabe, M. Shoji, T. Suehara, M. Tanaka, J. Tojo, T. Uchida, K. Ueno, H. Yasuda, T. Yoshioka

    2017 IEEE Nuclear Science Symposium and Medical Imaging Conference, NSS/MIC 2017 - Conference Proceedings   2018.11

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    Publishing type：Research paper (international conference proceedings)  

    © 2017 IEEE. The muon anomalous magnetic moment (g -2)-{\mu} and electric dipole moment (EDM) are sensitive to new physics beyond the Standard Model. We aim to measure ( g -2 ) -{\mu} with a precision of 0.1 parts per million and search for EDM with a sensitivity of 10 -21 e. cm at J-PARC. In this experiment, we use a silicon strip detector with high granularity and fast response to detect positrons from muon decay. The readout ASIC is required to tolerate a high hit rate of 1.4 MHz per strip, to be stable to the change of hit rate by a factor of 1 /150, and to have deep memory for the period of \sim 40 \mu \mathrm{s} with 5 ns resolution. The prototype readout ASIC SliT128A has been fabricated using the Silterra 0.18- \mu \mathrm{m} CMOS process. We also connected the SliT128A with a silicon strip sensor and tested it with a muon beam at J-PARC. In this paper, we report the performance of the prototype ASIC itself and the prototype detector module.

    DOI： 10.1109/NSSMIC.2017.8532754

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  • A challenge to lepton universality in B-meson decays Reviewed

    Gregory Ciezarek, Manuel Franco Sevilla, Brian Hamilton, Robert Kowalewski, Thomas Kuhr, Vera Lueth, Yutaro Sato

    NATURE   546 ( 7657 )   227 - 233   2017.6

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    Language：English   Publisher：NATURE PUBLISHING GROUP  

    One of the key assumptions of the standard model of particle physics is that the interactions of the charged leptons, namely electrons, muons and taus, differ only because of their different masses. Whereas precision tests comparing processes involving electrons and muons have not revealed any definite violation of this assumption, recent studies of B-meson decays involving the higher-mass tau lepton have resulted in observations that challenge lepton universality at the level of four standard deviations. A confirmation of these results would point to new particles or interactions, and could have profound implications for our understanding of particle physics.

    DOI： 10.1038/nature22346

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    Other Link： http://arxiv.org/pdf/1703.01766v3

  • Measurement of the branching ratio of B0 →d∗+τ- ν τ relative to B 0 →d∗+ℓ −νℓ decays with a semileptonic tagging method Reviewed

    Y. Sato, T. Iijima, K. Adamczyk, H. Aihara, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, T. Aziz, V. Babu, I. Badhrees, A. M. Bakich, V. Bansal, P. Behera, V. Bhardwaj, B. Bhuyan, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, D. Červenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, M. Danilov, N. Dash, S. Di Carlo, Z. DoleŽal, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, B. Golob, D. Greenwald, K. Hara, T. Hara, J. Hasenbusch, K. Hayasaka, H. Hayashii, S. Hirose, T. Horiguchi, W. S. Hou, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, H. B. Jeon, D. Joffe, T. Julius, K. H. Kang, Y. Kato, P. Katrenko, T. Kawasaki, D. Y. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Krokovny, T. Kuhr, R. Kumar, Y. J. Kwon, J. S. Lange, C. H. Li, L. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, H. K. Moon, K. R. Nakamura

    Physical Review D   94 ( 7 )   072007   2016.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    © 2016 American Physical Society. We report a measurement of the ratio R(D∗)=B(B0→D∗+τ-ντ)/B(B0→D∗+ν), where denotes an electron or a muon. The results are based on a data sample containing 772×106 BB pairs recorded at the (4S) resonance with the Belle detector at the KEKB e+e- collider. We select a sample of B0B0 pairs by reconstructing both B mesons in semileptonic decays to D∗ ±. We measure R(D∗)=0.302±0.030(stat)±0.011(syst), which is within 1.6σ of the Standard Model theoretical expectation, where the standard deviation σ includes systematic uncertainties. We use this measurement to constrain several scenarios of new physics in a model-independent approach.

    DOI： 10.1103/PhysRevD.94.072007

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  • Measurement of the branching ratio of (B)over-bar(0) -&gt; D*(+)tau(-)(nu)over-bar(tau) relative to (B)over-bar(0) -&gt; D*(+)l(-)(nu)over-bar(l) decays with a semileptonic tagging method Reviewed

    Y. Sato, T. Iijima, K. Adamczyk, H. Aihara, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, T. Aziz, V. Babu, I. Badhrees, A. M. Bakich, V. Bansal, P. Behera, V. Bhardwaj, B. Bhuyan, J. Biswal, G. Bonvicini, A. Bozek, M. Bracko, D. Cervenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, M. Danilov, N. Dash, S. Di Carlo, Z. Dolezal, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, B. Golob, D. Greenwald, K. Hara, T. Hara, J. Hasenbusch, K. Hayasaka, H. Hayashii, S. Hirose, T. Horiguchi, W. -S. Hou, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, H. B. Jeon, D. Joffe, T. Julius, K. H. Kang, Y. Kato, P. Katrenko, T. Kawasaki, D. Y. Kim, J. B. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, K. Kinoshita, P. Kodys, S. Korpar, D. Kotchetkov, P. Krokovny, T. Kuhr, R. Kumar, Y. -J. Kwon, J. S. Lange, C. H. Li, L. Li, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, H. K. Moon, K. R. Nakamura, E. Nakano, M. Nakao, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, K. Negishi, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, G. Pakhlova, B. Pal, C. -S. Park, S. Paul, T. K. Pedlar, L. Pesantez, R. Pestotnik, M. Petric, L. E. Piilonen, M. V. Purohit, J. Rauch, A. Rostomyan, M. Rozanska, Y. Sakai, S. Sandilya, L. Santelj, V. Savinov, T. Schlueter, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, T. -A. Shibata, J. -G. Shiu, B. Shwartz, F. Simon, E. Solovieva, S. Stanic, M. Staric, J. F. Strube, T. Sumiyoshi, M. Takizawa, U. Tamponi, F. Tenchini, K. Trabelsi, M. Uchida, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, C. Van Hulse, G. Varner, A. Vinokurova, V. Vorobyev, C. H. Wang, M. -Z. Wang, P. Wang, Y. Watanabe, K. M. Williams, E. Won, H. Yamamoto, J. Yamaoka, Y. Yamashita, J. Yelton, Y. Yook, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova, V. Zhulanov, A. Zupanc

    PHYSICAL REVIEW D   94 ( 7 )   2016.10

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    We report a measurement of the ratio R(D*) = B((B) over bar (0) -&gt; D*(+)tau(-)(nu) over bar (tau))/B((B) over bar (0) -&gt; D*(+)l(-)(nu) over bar (l))where l denotes an electron or a muon. The results are based on a data sample containing 772 x 10(6) B (B) over bar pairs recorded at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. We select a sample of B-0(B) over bar (0) pairs by reconstructing both B mesons in semileptonic decays to D*(-/+)l(+/-). We measure R(D*) = 0.302 +/- 0.030(stat) +/- 0.011(syst), which is within 1.6 sigma of the Standard Model theoretical expectation, where the standard deviation sigma includes systematic uncertainties. We use this measurement to constrain several scenarios of new physics in a model-independent approach.

    DOI： 10.1103/PhysRevD.94.072007

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  • Performance of the MCP-PMT for the Belle II TOP counter

    Kodai Matsuoka, Shigeki Hirose, Toru Iijima, Kenji Inami, Yuji Kato, Yosuke Maeda, Ryo Mizuno, Yutaro Sato, Kazuhito Suzuki

    Proceedings of International Conference on New Photo-detectors — PoS(PhotoDet2015)   2016.6

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    DOI： 10.22323/1.252.0028

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  • Measurement of the lepton forward-backward asymmetry in B -&gt; X(s)l(+)l(-) decays with a sum of exclusive modes Reviewed

    Y. Sato, A. Ishikawa, H. Yamamoto, A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, A. M. Bakich, A. Bala, V. Bhardwaj, B. Bhuyan, A. Bondar, G. Bonvicini, A. Bozek, M. Bracko, T. E. Browder, D. Cervenkov, V. Chekelian, A. Chen, B. G. Cheon, I. -S. Cho, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, M. Danilov, Z. Dolezal, Z. Drasal, A. Drutskoy, D. Dutta, K. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, V. Gaur, A. Garmash, R. Gillard, Y. M. Goh, B. Golob, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, X. H. He, Y. Hoshi, W. -S. Hou, H. J. Hyun, T. Iijima, R. Itoh, Y. Iwasaki, T. Iwashita, I. Jaegle, T. Julius, J. H. Kang, E. Kato, Y. Kato, H. Kawai, T. Kawasaki, H. Kichimi, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, J. Klucar, B. R. Ko, P. Kodys, S. Korpar, P. Krizan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. -J. Kwon, S. -H. Lee, Y. Li, J. Libby, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, P. Lukin, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, R. Mussa, M. Nakao, Z. Natkaniec, M. Nayak, E. Nedelkovska, N. K. Nisar, S. Nishida, O. Nitoh, S. Ogawa, P. Pakhlov, H. Park, H. K. Park, T. K. Pedlar, T. Peng, R. Pestotnik, M. Petric, L. E. Piilonen, E. Ribezl, M. Ritter, M. Roehrken, A. Rostomyan, H. Sahoo, T. Saito, Y. Sakai, S. Sandilya, D. Santel, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, R. Seidl, D. Semmler, K. Senyo, M. E. Sevior, M. Shapkin, C. P. Shen, T. -A. Shibata, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y. -S. Sohn, A. Sokolov, E. Solovieva, S. Stanic, M. Staric, T. Sumiyoshi, U. Tamponi, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, Y. Usov, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, K. E. Varvell, V. Vorobyev, C. H. Wang, M. -Z. Wang, P. Wang, X. L. Wang, Y. Watanabe, E. Won, J. Yamaoka, Y. Yamashita, S. Yashchenko, Y. Yook, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

    PHYSICAL REVIEW D   93 ( 3 )   2016.2

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    We report the first measurement of the lepton forward-backward asymmetry A(FB) as a function of the squared four-momentum of the dilepton system, q(2), for the electroweak penguin process B -&gt; X(s)l(+)l(-) with a sum of exclusive final states, where l is an electron or a muon and X-s is a hadronic recoil system with an s quark. The results are based on a data sample containing 772 x 10(6) B (B) over bar pairs recorded at the gamma (4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. A(FB) for the inclusive B -&gt; X(s)l(+)l(-) is extrapolated from the sum of 10 exclusive X-s states whose invariant mass is less than 2 GeV/c(2). For q(2) &gt; 10.2 GeV2/c(2), A(FB) &lt; 0 is excluded at the 2.3 sigma level, where sigma is the standard deviation. For q(2) &lt; 4.3 GeV2/c(2), the result is within 1.8 sigma of the standard model theoretical expectation.

    DOI： 10.1103/PhysRevD.93.032008

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  • Development of the micro-channel plate photomultiplier for the Belle II time-of-propagation counter Reviewed

    Shigeki Hirose, Toru Iijima, Kenji Inami, Daiki Furumura, Tomokatsu Hayakawa, Yuji Kato, Kodai Matsuoka, Ryo Mizuno, Yutaro Sato, Kazuhito Suzuki, Takuya Yonekura

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   787   293 - 296   2015.7

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

    The time-of-propagation counter for the Belle II experiment is a new particle identification device using ring imaging Cherenkov technique. In order to detect each Cherenkov photon with a timing precision of 30-40 ps in a 1.5 T magnetic field, a micro-channel plate photomultiplier tube is a suitable device for the TOP counter. By introducing an atomic layer deposition technique on the micro-channel plate surface, the tube lifetime was improved by a factor 01 3-10 relative to more conventional devices. A total of 530 tubes have been produced. To ensure appropriate tube performance, the quantum efficiency, gain and transit time spread have been measured for all units. The results from each measurement are discussed. Results from a beamtest with a 2 GeV/c positron beam are also reported and demonstrate the good tube performance. (C) 2015 Elsevier B.V. All rights reserved

    DOI： 10.1016/j.nima.2014.12.082

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  • Search for the dark photon and the dark higgs boson at belle Reviewed

    I. Jaegle, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, A. M. Bakich, V. Bansal, M. Barrett, B. Bhuyan, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, M. C. Chang, B. G. Cheon, K. Chilikin, K. Cho, V. Chobanova, S. K. Choi, Y. Choi, D. Cinabro, J. Dalseno, Z. DoleŽal, Z. Drásal, A. Drutskoy, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, O. Frost, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, D. Getzkow, R. Gillard, Y. M. Goh, B. Golob, O. Grzymkowska, K. Hayasaka, H. Hayashii, X. H. He, M. Hedges, W. S. Hou, T. Iijima, K. Inami, A. Ishikawa, Y. Iwasaki, T. Julius, K. H. Kang, E. Kato, T. Kawasaki, D. Y. Kim, J. B. Kim, J. H. Kim, S. H. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. KriŽan, P. Krokovny, A. Kuzmin, Y. J. Kwon, J. S. Lange, I. S. Lee, P. Lewis, L. Li Gioi, J. Libby, D. Liventsev, D. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, R. Mussa, E. Nakano, M. Nakao, N. K. Nisar, S. Nishida, S. Ogawa, P. Pakhlov, G. Pakhlova, H. Park, T. K. Pedlar, L. Pesántez, M. Petrič, L. E. Piilonen, M. Ritter, A. Rostomyan, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov

    Physical Review Letters   114 ( 21 )   1-6   2015.5

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    © 2015 American Physical Society. The dark photon A′ and the dark Higgs boson h′ are hypothetical constituents featured in a number of recently proposed dark sector models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgstrahlung channel e+e-→A′h′, with h′→A′A′. We investigate ten exclusive final states with A′→e+e-, μ+μ-, or π+π- in the mass ranges 0.1GeV/c2<mA′<3.5GeV/c2 and 0.2GeV/c2<mh′<10.5GeV/c2. We also investigate three inclusive final states 2(e+e-)X, 2(μ+μ-)X, and (e+e-)(μ+μ-)X, where X denotes a dark photon candidate detected via missing mass, in the mass ranges 1.1GeV/c2<mA′<3.5GeV/c2 and 2.2GeV/c2<mh′<10.5GeV/c2. Using the entire 977fb-1 data set collected by Belle, we observe no significant signal. We obtain individual and combined 90% credibility level upper limits on the branching fraction times the Born cross section, B×σBorn, on the Born cross section σBorn, and on the dark photon coupling to the dark Higgs boson times the kinetic mixing between the standard model photon and the dark photon, αD×ε2. These limits improve upon and cover wider mass ranges than previous experiments. The limits from the final states 3(π+π-) and 2(e+e-)X are the first placed by any experiment. For αD equal to 1/137, mh′<8GeV/c2, and mA′<1GeV/c2, we exclude values of the mixing parameter ε above ∼8×10-4.

    DOI： 10.1103/PhysRevLett.114.211801

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  • Performance of fully instrumented detector planes of the forward calorimeter of a Linear Collider detector Reviewed

    H. Abramowicz, A. Abusleme, K. Afanaciev, J. Aguilar, E. Alvarez, D. Avila, Y. Benhammou, L. Bortko, O. Borysov, M. Bergholz, I. Bozovic-Jelisavcic, E. Castro, G. Chelkov, C. Coca, W. Daniluk, L. Dumitru, K. Elsener, V. Fadeyev, M. Firlej, E. Firu, T. Fiutowski, V. Ghenescu, M. Gostkin, H. Henschel, M. Idzik, A. Ishikawa, S. Kananov, S. Kollowa, S. Kotov, J. Kotula, D. Kozhevnikov, V. Kruchonok, B. Krupa, Sz Kulis, W. Lange, T. Lesiak, A. Levy, I. Levy, W. Lohmann, S. Lukic, C. Milke, J. Moron, A. Moszczynski, A. T. Neagu, O. Novgorodova, K. Oliwa, M. Orlandea, M. Pandurovic, B. Pawlik, T. Preda, D. Przyborowski, O. Rosenblat, A. Sailer, Y. Sato, B. Schumm, S. Schuwalow, I. Smiljanic, P. Smolyanskiy, K. Swientek, E. Teodorescu, P. Terlecki, W. Wierba, T. Wojton, S. Yamaguchi, H. Yamamoto, L. Zawiejski, I. S. Zgural, A. Zhemchugov

    JOURNAL OF INSTRUMENTATION   10   P05009   2015.5

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    Detector-plane prototypes of the very forward calorimetry of a future detector at an e(+)e(-) collider have been built and their performance was measured in an electron beam. The detector plane comprises silicon or GaAs pad sensors, dedicated front-end and ADC ASICs, and an FPGA for data concentration. Measurements of the signal-to-noise ratio and the response as a function of the position of the sensor are presented. A deconvolution method is successfully applied, and a comparison of the measured shower shape as a function of the absorber depth with a Monte-Carlo simulation is given.

    DOI： 10.1088/1748-0221/10/05/P05009

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  • Measurement of the CP-violation parameter sin 2φ <inf>1</inf> with a new tagging method at the Y(5S) resonance Reviewed

    Y. Sato, H. Yamamoto, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, V. Bhardwaj, B. Bhuyan, M. Bischofberger, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, P. Chang, P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, I. S. Cho, K. Cho, S. K. Choi, Y. Choi, J. Dalseno, Z. Doleal, Z. Drásal, S. Eidelman, D. Epifanov, J. E. Fast, V. Gaur, N. Gabyshev, Y. M. Goh, B. Golob, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, T. Julius, P. Kapusta, T. Kawasaki, H. Kichimi, C. Kiesling, H. J. Kim, H. O. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, N. Kobayashi, P. Kody, S. Korpar, P. Krian, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. J. Kwon, J. S. Lange, S. H. Lee, J. Li, Y. Li, C. Liu, Z. Q. Liu, R. Louvot, S. McOnie, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, N. Muramatsu, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, W. Ostrowicz, P. Pakhlov

    Physical Review Letters   108 ( 17 )   2012.4

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    We report a measurement of the CP-violation parameter sin2φ 1 at the Υ(5S) resonance using a new tagging method, called "B-π tagging." In Υ(5S) decays containing a neutral B meson, a charged B, and a charged pion, the neutral B is reconstructed in the J/ψKS0 CP-eigenstate decay channel. The initial flavor of the neutral B meson at the moment of the Υ(5S) decay is opposite to that of the charged B and may thus be inferred from the charge of the pion without reconstructing the charged B. From the asymmetry between B-π + and B-π - tagged J/ψKS0 yields, we determine sin2φ 1=0.57±0.58(stat) ±0.06(syst). The results are based on 121fb -1 of data recorded by the Belle detector at the KEKB e +e - collider. © 2012 American Physical Society.

    DOI： 10.1103/PhysRevLett.108.171801

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  • Radiation test on FD-SOI readout ASIC of pair-monitor for ILC Reviewed

    Yutaro Sato, Yasuo Arai, Hirokazu Ikeda, Tadashi Nagamine, Yosuke Takubo, Toshiaki Tauchi, Hitoshi Yamamoto

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   650 ( 1 )   106 - 110   2011.9

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    The pair-monitor is a silicon pixel device that measures the beam profile at the interaction point of the International Linear Collider. It extracts information from the directional distribution of a large number of electron-positron pairs created by collision of bunches, and is required to tolerate radiation dose of about a few Mrad/year. We developed a prototype ASIC with OKI Semiconductor Co., Ltd. 0.2-mu m fully depleted SOI (FD-SOI) CMOS process and studied its radiation tolerance. In this paper, we describe the design of the readout circuit briefly and present the result of irradiation tests. (C) 2010 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.nima.2010.12.149

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    Other Link： http://arxiv.org/pdf/1006.4226v1

  • SOI readout ASIC of pair monitor for International Linear Collider Reviewed

    Yutaro Sato, Yasuo Arai, Hirokazu Ikeda, Tadashi Nagamine, Yosuke Takubo, Toshiaki Tauchi, Hitoshi Yamamoto

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   637 ( 1 )   53 - 59   2011.5

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    The pair monitor extracts information on the beam profile at the interaction point of the International Linear Collider. It utilizes the electron and positron number density distribution in the plane perpendicular to the beam direction. The pairs of electrons and positrons are detected by pixel detectors placed close to the beam on both sides of the interaction point, and a readout ASIC that meets the stringent requirements has been developed. In order to measure the beam profile as a function of location within a train and to deal with the high hit rate, the pixel detector is read out in 16 time-slices per bunch train. We develop the prototype ASIC using a 0.2 mu m fully depleted SOI (FD-SOI) CMOS process (OKI Semiconductor Co., Ltd). In this paper, we describe the design of the readout circuit and present the results of the performance tests. (C) 2011 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.nima.2011.02.063

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  • Readout ASIC of pair-monitor for international linear collider Reviewed

    Yutaro Sato, Hirokazu Ikeda, Kazutoshi Ito, Akiya Miyamoto, Tadashi Nagamine, Rei Sasaki, Yosuke Takubo, Toshiald Tauchi, Hitoshi Yamamoto

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   623 ( 1 )   501 - 503   2010.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：ELSEVIER  

    The pair-monitor is a beam profile monitor at the interaction point of the international linear collider. A prototype of the readout ASIC for the pair-monitor has been designed and tested. Since the pair-monitor uses the hit distribution of electrons and positrons generated by the beam-crossing to measure the beam profile, the readout ASIC is designed to count the number of hits. In a prototype ASIC, 36 readout cells were implemented by TSMC 0.25-mu m CMOS process. Each readout cell is equipped with an amplifier, comparator, 8-bit counter and 16 count-registers. By the operation test, all the ASIC component were confirmed to work correctly. As the next step, we develop the prototype ASIC with the silicon on insulator technology. It is produced with OKI 0.2-mu m FD-SOI CMOS process. (C) 2010 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.nima.2010.03.050

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  • Pixelated Readout Circuit for Pair-Monitor at International Linear Collider Reviewed

    Yutaro Sato, Kentaro Hashimoto, Hirokazu Ikeda, Kazutoshi Ito, Akiya Miyamoto, Tadashi Nagamine, Rei Sasaki, Yosuke Takubo, Toshiaki Tauchi, Hitoshi Yamamoto, Yasuhiro Yokoyama

    IEEE TRANSACTIONS ON NUCLEAR SCIENCE   57 ( 1 )   288 - 291   2010.2

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    The pair monitor measures the beam profile at the interaction point of the international linear collider. It extracts the information from the directional distribution of a large number of electron-positron pairs created by collision of bunches. The pairs are detected by pixel detectors placed close to the beam on both sides of the interaction point, and a readout ASIC that meets the stringent requirements has been developed. In order to measure the beam profile as a function of location within a train, and also to deal with the high hit rate, the pixel detector is read out in 16 time slices per bunch train. In this paper, we describe the design of the readout circuit and present the result of performance tests.

    DOI： 10.1109/TNS.2009.2037960

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  • Status and prospect for anomalies in B-meson decays Reviewed

    Yuta Takahashi, Shigeki Hirose, Yutaro Sato, Katsuro Nakamura

    JPS Magazine   75 ( 6 )   16   2020.1

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  • J-PARC muon g-2/EDM experiment: Development of 128ch Front-End ASIC for Silicon Strip Detector Readout: II

    藤田陽一, 藤田陽一, 青柳泰平, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 牛澤昂大, 内田智久, 内田智久, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 来見田将大, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐田智也, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 末原大幹, 末原大幹, 須江祐貴, 須田利美, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 塚田暁, 東城順治, 東城順治, 西村昇一郎, 西村昇一郎, 本多佑記, 眞玉将豊, 眞玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 山中隆志, 吉岡瑞樹, 吉岡瑞樹, LEE W.

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

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  • J-PARC muon g - 2/EDM experiment: Estimation of measurement precision using the track reconstruction algorithm for decay positrons

    山中隆志, 佐藤優太郎, 須江祐貴, 末原大幹, 三部勉, 吉岡瑞樹, LEE Soohyung, LEE Woodo, DA SILVA Wilfrid

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

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  • Development of an assembling method with high position accuracy for a silicon strip detector

    来見田将大, 青柳泰平, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 牛澤昂大, 内田智久, 内田智久, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐田智也, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 末原大幹, 末原大幹, 須江祐貴, 須田利美, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 塚田暁, 東城順治, 東城順治, 西村昇一郎, 西村昇一郎, 藤田陽一, 藤田陽一, 本多佑記, 眞玉将豊, 眞玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 山中隆志, 吉岡瑞樹, 吉岡瑞樹, LEE W.

    日本物理学会講演概要集(CD-ROM)   75 ( 1 )   2020

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  • J-PARC muon g-2/EDM実験:シリコンストリップ検出器における冷却システムの開発

    牛澤昂大, 青柳泰平, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 内田智久, 内田智久, OH Jeawhan, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐田智也, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, JANGAM Viraj, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 須江祐貴, 須田利美, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 塚田暁, 堤裕樹, 堤裕樹, 東城順治, 東城順治, 南波和希, 西村昇一郎, 西村昇一郎, 本多佑記, 眞玉将豊, 眞玉将豊, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 山中隆志, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

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  • J-PARC muon g-2/EDM実験:シリコンストリップ検出器の試験モジュールの製作と実機製作に向けた開発

    山中隆志, 山中隆志, 青柳泰平, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 牛澤昂大, 内田智久, 内田智久, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐田智也, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 須江祐貴, 須田利美, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 塚田暁, 堤裕樹, 堤裕樹, 東城順治, 東城順治, 南波和希, 西村昇一郎, 西村昇一郎, 本多佑記, 眞玉将豊, 眞玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

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  • J-PARC muon g-2/EDM実験:シリコンストリップ検出器用読出しASICの設計と性能評価

    堤裕樹, 堤裕樹, 青柳泰平, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 牛澤昂大, 内田智久, 内田智久, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐田智也, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 須江祐貴, 須田利美, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 塚田暁, 東城順治, 東城順治, 南波和希, 西村昇一郎, 西村昇一郎, 本多佑記, 眞玉将豊, 眞玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 山中隆志, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   74 ( 1 )   2019

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  • J-PARC muon g-2/EDM実験:シリコンストリップ検出器用読み出しASICの開発

    藤田陽一, 藤田陽一, 青柳泰平, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 牛澤昂大, 内田智久, 内田智久, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 来見田将大, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐田智也, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 須江祐貴, 須田利美, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 塚田暁, 堤裕樹, 堤裕樹, 東城順治, 東城順治, 南波和希, 西村昇一郎, 西村昇一郎, 本多佑記, 眞玉将豊, 眞玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 山中隆志, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   74 ( 2 )   2019

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  • The Belle II Physics Book

    E. Kou, P. Urquijo, W. Altmannshofer, F. Beaujean, G. Bell, M. Beneke, I. I. Bigi, F. Bishara M. Blanke, C. Bobeth, M. Bona, N. Brambilla, V. M. Braun, J. Brod, A. J. Buras, H. Y. Cheng, C. W. Chiang, G. Colangelo, H. Czyz, A. Datta, F. De Fazio, T. Deppisch, M. J. Dolan, S. Fajfer, T. Feldmann, S. Godfrey, M. Gronau, Y. Grossman, F. K. Guo, U. Haisch, C. Hanhart, S. Hashimoto, S. Hirose, J. Hisano, L. Hofer, M. Hoferichter, W. S. Hou, T. Huber, S. Jaeger, S. Jahn, M. Jamin, J. Jones, M. Jung, A. L. Kagan, F. Kahlhoefer, J. F. Kamenik, T. Kaneko, Y. Kiyo, A. Kokulu, N. Kosnik, A. S. Kronfeld, Z. Ligeti, H. Logan, C. D. Lu, V. Lubicz, F. Mahmoudi, K. Maltman, M. Misiak, S. Mishima, K. Moats, B. Moussallam, A. Nefediev, U. Nierste, D. Nomura, N. Offen, S. L. Olsen, E. Passemar, A. Paul, G. Paz, A. A. Petrov, A. Pich, A. D. Polosa, J. Pradler, S. Prelovsek, M. Procura, G. Ricciardi, D. J. Robinson, P. Roig, S. Schacht, K. Schmidt-Hoberg, J. Schwichtenberg, S. R. Sharpe, J. Shigemitsu, N. Shimizu, Y. Shimizu, L. Silvestrini, S. Simula, C. Smith, P. Stoffer, D. Straub, F. J. Tackmann, M. Tanaka, A. Tayduganov, G. Tetlalmatzi-Xolocotzi, T. Teubner, A. Vairo, D. van Dyk, J. Virto, Z. Was, R. Watanabe, I. Watson, J. Zupan, R. Zwicky, F. Abudinen, I. Adachi, K. Adamczyk, P. Ahlburg, H. Aihara, A. Aloisio, L. Andricek, N. Anh Ky, M. Arndt, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, R. Ayad, T. Aziz, S. Baehr, S. Bahinipati, P. Bambade, Y. Ban, M. Barrett, J. Baudot, P. Behera, K. Belous, M. Bender, J. Bennett, M. Berger, E. Bernieri, F. U. Bernlochner, M. Bessner, D. Besson, S. Bettarini, V. Bhardwaj, B. Bhuyan, T. Bilka, S. Bilmis, S. Bilokin, G. Bonvicini, A. Bozek, M. Bracko, P. Branchini, N. Braun, R. A. Briere, T. E. Browder, L. Burmistrov, S. Bussino, L. Cao, G. Caria, G. Casarosa, C. Cecchi, D. Cervenkov, M. -C. Chang, P. Chang, R. Cheaib, V. Chekelian, Y. Chen, B. G. Cheon, K. Chilikin, K. Cho, J. Choi, S. -K. Choi, S. Choudhury, D. Cinabro, L. M. Cremaldi, D. Cuesta, S. Cunliffe, N. Dash, E. de, la, Cruz Burelo, E. De Lucia, G. De Nardo, M. De Nuccio, G. De Pietro, A. De, Yta Hernandez, B. Deschamps, M. Destefanis, S. Dey, F. Di Capua, S. Di Carlo, J. Dingfelder, Z. Dolezal, I. Dominguez Jimenez, T. V. Dong, D. Dossett, S. Duell, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, S. Fiore, A. Fodor, F. Forti, A. Frey, O. Frost, B. G. Fulsom, M. Gabriel, N. Gabyshev, E. Ganiev, X. Gao, B. Gao, R. Garg, A. Garmash, V. Gaur, A. Gaz, T. Gessler, U. Gebauer, M. Gelb, A. Gellrich, D. Getzkow, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, B. Golob, W. Gradl, E. Graziani, M. Greco, D. Greenwald, S. Gribanov, Y. Guan, E. Guido, A. Guo, S. Halder, K. Hara, O. Hartbrich, T. Hauth, K. Hayasaka, H. Hayashii, C. Hearty, I. Heredia De, La Cruz, M. Hernandez Villanueva, A. Hershenhorn, T. Higuchi, M. Hoek, S. Hollitt, N. T. Hong Van, C. -L. Hsu, Y. Hu, K. Huang, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, Y. Iwasaki, M. Iwasaki, P. Jackson, W. W. Jacobs, I. Jaegle, H. B. Jeon, X. Ji, S. Jia, Y. Jin, C. Joo, M. Kuenzel, I. Kadenko, J. Kahn, H. Kakuno, A. B. Kaliyar, J. Kandra, K. H. Kang, T. Kawasaki, C. Ketter, M. Khasmidatul, H. Kichimi, J. B. Kim, K. T. Kim, H. J. Kim, D. Y. Kim, K. Kim, Y. Kim, T. D. Kimmel, H. Kindo, K. Kinoshita, T. Konno, A. Korobov, S. Korpar, D. Kotchetkov, R. Kowalewski, P. Krizan, R. Kroeger, J. -F. Krohn, P. Krokovny, W. Kuehn, T. Kuhr, R. Kulasiri, M. Kumar, R. Kumar, T. Kumita, A. Kuzmin, Y. -J. Kwon, S. Lacaprara, Y. -T. Lai, K. Lalwani, J. S. Lange, S. C. Lee, J. Y. Lee, P. Leitl, D. Levit, S. Levonian, S. Li, L. K. Li, Y. Li, Y. B. Li, Q. Li, L. Li Gioi, J. Libby, Z. Liptak, D. Liventsev, S. Longo, A. Loos, G. Lopez Castro, M. Lubej, T. Lueck, F. Luetticke, T. Luo, F. Mueller, Th. Mueller, C. MacQueen, Y. Maeda, M. Maggiora, S. Maity, E. Manoni, S. Marcello, C. Marinas, M. Martinez Hernandez, A. Martini, D. Matvienko, J. A. McKenna, F. Meier, M. Merola, F. Metzner, C. Miller, K. Miyabayashi, H. Miyake, H. Miyata, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Moon, A. Morda, T. Morii, M. Mrvar, G. Muroyama, R. Mussa, I. Nakamura, T. Nakano, M. Nakao, H. Nakayama, H. Nakazawa, T. Nanut, M. Naruki, K. J. Nath, M. Nayak, N. Nellikunnummel, D. Neverov, C. Niebuhr, J. Ninkovic, S. Nishida, K. Nishimura, M. Nouxman, G. Nowak, K. Ogawa, Y. Onishchuk, H. Ono, Y. Onuki, P. Pakhlov, G. Pakhlova, B. Pal, E. Paoloni, H. Park, C. -S. Park, B. Paschen, A. Passeri, S. Paul, T. K. Pedlar, M. Perello, I. M. Peruzzi, R. Pestotnik, L. E. Piilonen, L. Podesta Lerma, V. Popov, K. Prasanth, E. Prencipe, M. Prim, M. V. Purohit, A. Rabusov, R. Rasheed, S. Reiter, M. Remnev, P. K. Resmi, I. Ripp-Baudot, M. Ritter, M. Ritzert, G. Rizzo, L. Rizzuto, S. H. Robertson, D. Rodriguez Perez, J. M. Roney, C. Rosenfeld, A. Rostomyan, N. Rout, S. Rummel, G. Russo, D. Sahoo, Y. Sakai, M. Salehi, D. A. Sanders, S. Sandilya, A. Sangal, L. Santelj, J. Sasaki, Y. Sato, V. Savinov, B. Scavino, M. Schram, H. Schreeck, J. Schueler, C. Schwanda, A. J. Schwartz, R. M. Seddon, Y. Seino, K. Senyo, O. Seon, I. S. Seong, M. E. Sevior, C. Sfienti, M. Shapkin, C. P. Shen, M. Shimomura, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, R. Sinha, S. Skambraks, K. Smith, R. J. Sobie, A. Soffer, A. Sokolov, E. Solovieva, B. Spruck, S. Stanic, M. Staric, N. Starinsky, U. Stolzenberg, Z. Stottler, R. Stroili, J. F. Strube, J. Stypula, M. Sumihama, K. Sumisawa, T. Sumiyoshi, D. Summers, W. Sutcliffe, S. Y. Suzuki, M. Tabata, M. Takahashi, M. Takizawa, U. Tamponi, J. Tan, S. Tanaka, K. Tanida, N. Taniguchi, Y. Tao, P. Taras, G. Tejeda Munoz, F. Tenchini, U. Tippawan, E. Torassa, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, R. van Tonder, G. Varner, K. E. Varvell, A. Vinokurova, L. Vitale, M. Vos, A. Vossen, E. Waheed, H. Wakeling, K. Wan, M, Z. Wang, X. L. Wang, B. Wang, A. Warburton, J. Webb, S. Wehle, C. Wessel, J. Wiechczynski, P. Wieduwilt, E. Won, Q. Xu, X. Xu, B. D. Yabsley, S. Yamada, H. Yamamoto, W. Yan, W. Yan, S. B. Yang, H. Ye, I. Yeo, J. H. Yin, M. Yonenaga, T. Yoshinobu, W. Yuan, C. Z. Yuan, Y. Yusa, S. Zakharov, L. Zani, M. Zeyrek, J. Zhang, Y. Zhang, Y. Zhang, X. Zhou, V. Zhukova, V. Zhulanov, A. Zupanc

    2018.8

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    Publishing type：Internal/External technical report, pre-print, etc.  

    We present the physics program of the Belle II experiment, located on the<br />
    intensity frontier SuperKEKB $e^+e^-$ collider. Belle II collected its first<br />
    collisions in 2018, and is expected to operate for the next decade. It is<br />
    anticipated to collect 50/ab of collision data over its lifetime. This book is<br />
    the outcome of a joint effort of Belle II collaborators and theorists through<br />
    the Belle II theory interface platform (B2TiP), an effort that commenced in<br />
    2014. The aim of B2TiP was to elucidate the potential impacts of the Belle II<br />
    program, which includes a wide scope of physics topics: B physics, charm, tau,<br />
    quarkonium, electroweak precision measurements and dark sector searches. It is<br />
    composed of nine working groups (WGs), which are coordinated by teams of<br />
    theorist and experimentalists conveners: Semileptonic and leptonic B decays,<br />
    Radiative and Electroweak penguins, phi_1 and phi_2 (time-dependent CP<br />
    violation) measurements, phi_3 measurements, Charmless hadronic B decay, Charm,<br />
    Quarkonium(like), tau and low-multiplicity processes, new physics and global<br />
    fit analyses. This book highlights &quot;golden- and silver-channels&quot;, i.e. those<br />
    that would have the highest potential impact in the field. Theorists<br />
    scrutinised the role of those measurements and estimated the respective<br />
    theoretical uncertainties, achievable now as well as prospects for the future.<br />
    Experimentalists investigated the expected improvements with the large dataset<br />
    expected from Belle II, taking into account improved performance from the<br />
    upgraded detector.

    arXiv

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  • J‐PARCmuong‐2/EDM実験:シリコンストリップ検出器の実機製作に向けた開発状況

    山中隆志, 山中隆志, 池田博一, 池田博一, 池野正弘, 池野正弘, 伊藤拓実, 上野一樹, 上野一樹, 内田智久, 内田智久, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 須江祐貴, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 堤裕樹, 堤裕樹, 東城順治, 東城順治, 西村昇一郎, 西村昇一郎, 真玉将豊, 真玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.22pK206‐1   2018.3

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    Language：Japanese  

    J-GLOBAL

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  • J‐PARC muon g‐2/EDM実験:シリコンストリップ検出器用読み出しASICの性能評価

    堤裕樹, 堤裕樹, 池田博一, 池田博一, 池野正弘, 池野正弘, 伊藤拓実, 上野一樹, 上野一樹, 内田智久, 内田智久, 川越清以, 岸下徹一, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐藤伸彦, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 須江祐貴, 千代浩司, 千代浩司, 高富俊和, 田中真伸, 田中真伸, 東城順治, 東城順治, 西村昇一郎, 西村昇一郎, 真玉将豊, 真玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 山中隆志, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   73 ( 1 )   ROMBUNNO.22pK206‐3   2018.3

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  • J-PARC muon g-2/EDM実験:崩壊陽電子飛跡の再構成アルゴリズムの開発

    山中隆志, 飯嶋徹, 飯嶋徹, 飯沼裕美, 上野一樹, 佐藤優太郎, 須江祐貴, 末原大幹, 西村昇一郎, 三部勉, 吉岡瑞樹, LEE Soohyung, DA SILVA Wifrid

    日本物理学会講演概要集(CD-ROM)   73 ( 2 )   2018

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  • J-PARC muon g-2/EDM実験:SliT2016TEGの性能評価

    堤裕樹, 池田博一, 池田博一, 池野正弘, 池野正弘, 伊藤拓実, 上野一樹, 上野一樹, 内田智久, 内田智久, 川越清以, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 千代浩司, 田中真伸, 田中真伸, 東城順治, 東城順治, 西村昇一郎, 西村昇一郎, 真玉将豊, 真玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   2017

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  • J-PARC muon g-2/EDM実験:シリコンストリップセンサーの性能評価および品質保証システムの開発

    伊藤拓実, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 内田智久, 内田智久, 川越清以, 岸下徹一, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 千代浩司, 千代浩司, 田中真伸, 田中真伸, 堤裕樹, 東城順治, 東城順治, 西村昇一郎, 西村昇一郎, 真玉将豊, 真玉将豊, 三部勉, 三部勉, 村上武, 村上武, 安田浩昌, 安田浩昌, 山中隆志, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   72 ( 2 )   2017

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  • J-PARC muon g-2/EDM実験:シリコンストリップセンサー量産にむけた性能評価および品質検査手法開発

    伊藤拓実, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 内田智久, 内田智久, 川越清以, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 田中真伸, 田中真伸, 東城順治, 東城順治, 長澤翼, 長澤翼, 西村昇一郎, 西村昇一郎, 真玉将豊, 真玉将豊, 三部勉, 三部勉, 村上武, 村上武, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   2017

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  • J-PARC muon g-2/EDM実験:シリコンストリップ検出器の性能評価試験

    西村昇一郎, 西村昇一郎, 池田博一, 池田博一, 池野正弘, 池野正弘, 伊藤拓実, 上野一樹, 上野一樹, 内田智久, 内田智久, 川越清以, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 田中真伸, 田中真伸, 東城順治, 東城順治, 長澤翼, 長澤翼, 真玉将豊, 真玉将豊, 三部勉, 三部勉, 村上武, 村上武, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   72 ( 1 )   2017

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  • Measurement of the branching ratio of $\bar{B}^0 \rightarrow D^{*+} τ^- \barν_τ$ relative to $\bar{B}^0 \rightarrow D^{*+} \ell^- \barν_{\ell}$ decays with a semileptonic tagging method

    A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, K. Arinstein, Y. Arita, D. M. Asner, T. Aso, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, T. Aziz, V. Babu, I. Badhrees, S. Bahinipati, A. M. Bakich, A. Bala, Y. Ban, V. Bansal, E. Barberio, M. Barrett, W. Bartel, A. Bay, I. Bedny, P. Behera, M. Belhorn, K. Belous, D. Besson, V. Bhardwaj, B. Bhuyan, M. Bischofberger, J. Biswal, T. Bloomfield, S. Blyth, A. Bobrov, A. Bondar, G. Bonvicini, C. Bookwalter, C. Boulahouache, A. Bozek, M. Brač, F. Breibeck, J. Brodzicka, T. E. Browder, D. Č, M. -C. Chang, P. Chang, Y. Chao, V. Chekelian, A. Chen, K. -F. Chen, P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, S. -K. Choi, Y. Choi, D. Cinabro, J. Crnkovic, J. Dalseno, M. Danilov, N. Dash, S. Di Carlo, J. Dingfelder, Z. Dolež, Z. Drásal, A. Drutskoy, S. Dubey, D. Dutta, K. Dutta, S. Eidelman, D. Epifanov, S. Esen, H. Farhat, J. E. Fast, M. Feindt, T. Ferber, A. Frey, O. Frost, M. Fujikawa, B. G. Fulsom, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, D. Getzkow, R. Gillard, F. Giordano, R. Glattauer, Y. M. Goh, P. Goldenzweig, B. Golob, D. Greenwald, M. Grosse Perdekamp, J. Grygier, O. Grzymkowska, H. Guo, J. Haba, P. Hamer, Y. L. Han, K. Hara, T. Hara, Y. Hasegawa, J. Hasenbusch, K. Hayasaka, H. Hayashii, X. H. He, M. Heck, M. T. Hedges, D. Heffernan, M. Heider, A. Heller, T. Higuchi, S. Himori, S. Hirose, T. Horiguchi, Y. Hoshi, K. Hoshina, W. -S. Hou, Y. B. Hsiung, C. -L. Hsu, M. Huschle, H. J. Hyun, Y. Igarashi, T. Iijima, M. Imamura, K. Inami, G. Inguglia, A. Ishikawa, K. Itagaki, R. Itoh, M. Iwabuchi, M. Iwasaki, Y. Iwasaki, S. Iwata, W. W. Jacobs, I. Jaegle, H. B. Jeon, D. Joffe, M. Jones, K. K. Joo, T. Julius, H. Kakuno, J. H. Kang, K. H. Kang, P. Kapusta, S. U. Kataoka, E. Kato, Y. Kato, P. Katrenko, H. Kawai, T. Kawasaki, T. Keck, H. Kichimi, C. Kiesling, B. H. Kim, D. Y. Kim, H. J. Kim, H. -J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, S. K. Kim, Y. J. Kim, K. Kinoshita, C. Kleinwort, J. Klucar, B. R. Ko, N. Kobayashi, S. Koblitz, P. Kodyš, Y. Koga, S. Korpar, D. Kotchetkov, R. T. Kouzes, P. Križ, P. Krokovny, B. Kronenbitter, T. Kuhr, R. Kumar, T. Kumita, E. Kurihara, Y. Kuroki, A. Kuzmin, P. Kvasnič, Y. -J. Kwon, Y. -T. Lai, J. S. Lange, D. H. Lee, I. S. Lee, S. -H. Lee, M. Leitgab, R. Leitner, D. Levit, P. Lewis, C. H. Li, H. Li, J. Li, L. Li, X. Li, Y. Li, L. Li Gioi, J. Libby, A. Limosani, C. Liu, Y. Liu, Z. Q. Liu, D. Liventsev, A. Loos, R. Louvot, M. Lubej, P. Lukin, T. Luo, J. MacNaughton, M. Masuda, T. Matsuda, D. Matvienko, A. Matyja, S. McOnie, Y. Mikami, K. Miyabayashi, Y. Miyachi, H. Miyake, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, S. Mohanty, D. Mohapatra, A. Moll, H. K. Moon, T. Mori, T. Morii, H. -G. Moser, T. Müller, N. Muramatsu, R. Mussa, T. Nagamine, Y. Nagasaka, Y. Nakahama, I. Nakamura, K. R. Nakamura, E. Nakano, H. Nakano, T. Nakano, M. Nakao, H. Nakayama, H. Nakazawa, T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, E. Nedelkovska, K. Negishi, K. Neichi, C. Ng, C. Niebuhr, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, O. Nitoh, T. Nozaki, A. Ogawa, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, Y. Ono, Y. Onuki, W. Ostrowicz, C. Oswald, H. Ozaki, P. Pakhlov, G. Pakhlova, B. Pal, H. Palka, E. Panzenböck, C. -S. Park, C. W. Park, H. Park, K. S. Park, S. Paul, L. S. Peak, T. K. Pedlar, T. Peng, L. Pesá, R. Pestotnik, M. Peters, M. Petrič, L. E. Piilonen, A. Poluektov, K. Prasanth, M. Prim, K. Prothmann, C. Pulvermacher, M. V. Purohit, J. Rauch, B. Reisert, E. Ribež, M. Ritter, M. Röhrken, J. Rorie, A. Rostomyan, M. Rozanska, S. Rummel, S. Ryu, H. Sahoo, T. Saito, K. Sakai, Y. Sakai, S. Sandilya, D. Santel, L. Santelj, T. Sanuki, N. Sasao, Y. Sato, V. Savinov, T. Schlü, O. Schneider, G. Schnell, P. Schönmeier, M. Schram, C. Schwanda, A. J. Schwartz, B. Schwenker, R. Seidl, Y. Seino, A. Sekiya, D. Semmler, K. Senyo, O. Seon, I. S. Seong, M. E. Sevior, L. Shang, M. Shapkin, V. Shebalin, C. P. Shen, T. -A. Shibata, H. Shibuya, S. Shinomiya, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, J. B. Singh, R. Sinha, P. Smerkol, Y. -S. Sohn, A. Sokolov, Y. Soloviev, E. Solovieva, S. Stanič, M. Starič, M. Steder, J. F. Strube, J. Stypula, S. Sugihara, A. Sugiyama, M. Sumihama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, Z. Suzuki, H. Takeichi, M. Takizawa, U. Tamponi, M. Tanaka, S. Tanaka, K. Tanida, N. Taniguchi, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, V. Trusov, Y. F. Tse, T. Tsuboyama, M. Uchida, T. Uchida, S. Uehara, K. Ueno, T. Uglov, Y. Unno, S. Uno, S. Uozumi, P. Urquijo, Y. Ushiroda, Y. Usov, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, K. E. Varvell, K. Vervink, A. Vinokurova, V. Vorobyev, A. Vossen, M. N. Wagner, C. H. Wang, J. Wang, M, Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, R. Wedd, S. Wehle, E. White, J. Wiechczynski, K. M. Williams, E. Won, B. D. Yabsley, S. Yamada, H. Yamamoto, J. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yashchenko, H. Ye, J. Yelton, Y. Yook, C. Z. Yuan, Y. Yusa, C. C. Zhang, L. M. Zhang, Z. P. Zhang, L. Zhao, V. Zhilich, V. Zhukova, V. Zhulanov, M. Ziegler, T. Zivko, A. Zupanc, N. Zwahlen, O. Zyukova

    2016.3

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    Publishing type：Internal/External technical report, pre-print, etc.  

    We report a measurement of ratio ${\cal R}(D^*) = {\cal B}(\bar{B}^0<br />
    \rightarrow D^{*+} \tau^- \bar{\nu}_{\tau})/{\cal B}(\bar{B}^0 \rightarrow<br />
    D^{*+} \ell^- \bar{\nu}_{\ell})$, where $\ell$ denotes an electron or a muon.<br />
    The results are based on a data sample containing $772\times10^6$ $B\bar{B}$<br />
    pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the<br />
    KEKB $e^+ e^-$ collider. We select a sample of $B^0 \bar{B}^0$ pairs by<br />
    reconstructing both $B$ mesons in semileptonic decays to $D^{*\mp} \ell^{\pm}$.<br />
    We measure ${\cal R}(D^*)= 0.302 \pm 0.030({\rm stat)} \pm 0.011({\rm syst)}$,<br />
    which is within $1.6 \sigma$ of the Standard Model theoretical expectation,<br />
    where $\sigma$ is the standard deviation including systematic uncertainties.

    arXiv

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  • J-PARC muon g-2/EDM実験:シリコンストリップセンサー実機の基礎特性評価

    西村昇一郎, 西村昇一郎, 池田博一, 池田博一, 池野正弘, 池野正弘, 上野一樹, 上野一樹, 内田智久, 内田智久, 川越清以, 久米達哉, 高力孝, 高力孝, 齊藤直人, 佐々木修, 佐々木修, 佐藤優太郎, 佐藤優太郎, 庄子正剛, 庄子正剛, 調翔平, 調翔平, 末原大幹, 末原大幹, 田中真伸, 田中真伸, 東城順治, 東城順治, 長澤翼, 長澤翼, 真玉将豊, 真玉将豊, 三部勉, 三部勉, 村上武, 村上武, 吉岡瑞樹, 吉岡瑞樹

    日本物理学会講演概要集(CD-ROM)   71 ( 2 )   2016

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  • Inclusive $B$ decays and exclusive radiative decays by Belle

    Yutaro Sato

    2014.11

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    Publishing type：Internal/External technical report, pre-print, etc.  

    The $b \rightarrow s \gamma$, $b \rightarrow d \gamma$ and $b \rightarrow s
    \ell^+ \ell^-$ processes are allowed at higher order via the electroweak loop
    or box diagrams in the Standard model. It is sensitive probe to search for new
    physics beyond the Standard model because new particles might enter in the
    loop.
    We present preliminary results of branching fraction of the $\bar{B}
    \rightarrow X_s \gamma$, $CP$ asymmetry in the $\bar{B} \rightarrow X_{s+d}
    \gamma$, and the forward-backward asymmetry in the $\bar{B} \rightarrow X_s
    \ell^+ \ell^-$. The results are based on a data sample containing $772 \times
    10^6 B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle
    detector at the KEKB $e^+ e^-$ collider.

    arXiv

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    Other Link： http://arxiv.org/pdf/1411.3773v1

  • Search for lepton-flavor and lepton-number-violating Τ→ℓhh' decay modes

    Y. Miyazaki, K. Hayasaka, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bay, V. Bhardwaj, B. Bhuyan, M. Bischofberger, A. Bozek, M. Bračko, T. E. Browder, M. C. Chang, A. Chen, P. Chen, B. G. Cheon, R. Chistov, K. Cho, Y. Choi, J. Dalseno, Z. Doležal, A. Drutskoy, S. Eidelman, D. Epifanov, J. E. Fast, V. Gaur, N. Gabyshev, A. Garmash, Y. M. Goh, J. Haba, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Julius, J. H. Kang, C. Kiesling, H. J. Kim, H. O. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, B. R. Ko, S. Koblitz, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, A. Kuzmin, Y. J. Kwon, S. H. Lee, Y. Li, C. L. Lim, C. Liu, Z. Q. Liu, D. Liventsev, R. Louvot, D. Matvienko, S. McOnie, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, N. Muramatsu, E. Nakano, M. Nakao, S. Nishida, K. Nishimura, O. Nitoh, S. Ogawa, T. Ohshima, S. Okuno, Y. Onuki, P. Pakhlov, G. Pakhlova, C. W. Park, H. K. Park, M. Petrič, L. E. Piilonen, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, T. Sanuki, Y. Sato, O. Schneider, C. Schwanda, K. Senyo, O. Seon

    Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics   719 ( 4-5 )   346 - 353   2013.2

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    We search for lepton-flavor and lepton-number-violating. Τ decays into a lepton (ℓ= electron or muon) and two charged mesons (h,h'=π± or K±) using 854 fb<sup>-1</sup> of data collected with the Belle detector at the KEKB asymmetric-energy e<sup>+</sup>e<sup>-</sup> collider. We obtain 90% confidence level upper limits on the. Τ→ℓhh' branching fractions in the range. (2.0-8.4)×10<sup>-8</sup>. These results improve upon our previously published upper limits by factors of about 1.8 on average. © 2013 Elsevier B.V.

    DOI： 10.1016/j.physletb.2013.01.032

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  • Precise measurement of the branching fractions for B-s(0) -&gt; D-s(()*()+) D-s(()*()-) and first measurement of the D-s*(+) D-s*(-) polarization using e(+)e(-) collisions

    S. Esen, A. J. Schwartz, H. Aihara, D. M. Asner, T. Aushev, A. M. Bakich, K. Belous, B. Bhuyan, A. Bozek, M. Bracko, T. E. Browder, V. Chekelian, A. Chen, P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, I. -S. Cho, K. Cho, Y. Choi, J. Dalseno, M. Danilov, Z. Dolezal, A. Drutskoy, S. Eidelman, M. Feindt, V. Gaur, J. Haba, T. Hara, H. Hayashii, Y. Horii, Y. Hoshi, W. -S. Hou, Y. B. Hsiung, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, M. Iwabuchi, Y. Iwasaki, T. Iwashita, T. Julius, J. H. Kang, T. Kawasaki, C. Kiesling, H. O. Kim, K. T. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, S. Koblitz, P. Kodys, S. Korpar, R. T. Kouzes, P. Krizan, P. Krokovny, T. Kuhr, T. Kumita, Y. -J. Kwon, S. -H. Lee, J. Li, Y. Li, J. Libby, C. Liu, Y. Liu, D. Liventsev, R. Louvot, S. McOnie, H. Miyata, R. Mizuk, D. Mohapatra, A. Moll, N. Muramatsu, M. Nakao, H. Nakazawa, Z. Natkaniec, C. Ng, S. Nishida, K. Nishimura, O. Nitoh, T. Ohshima, S. Okuno, S. L. Olsen, Y. Onuki, G. Pakhlova, C. W. Park, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petric, L. E. Piilonen, M. Roehrken, S. Ryu, Y. Sakai, D. Santel, L. Santelj, T. Sanuki, Y. Sato, O. Schneider, C. Schwanda, K. Senyo, M. E. Sevior, M. Shapkin, T. -A. Shibata, J. -G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, P. Smerkol, Y. -S. Sohn, A. Sokolov, E. Solovieva, S. Stanic, M. Staric, T. Sumiyoshi, G. Tatishvili, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, S. E. Vahsen, P. Vanhoefer, G. Varner, C. H. Wang, M. -Z. Wang, P. Wang, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, Y. Yamashita, Z. P. Zhang, V. Zhilich, V. Zhulanov

    PHYSICAL REVIEW D   87 ( 3 )   2013.2

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    Language：English   Publisher：AMER PHYSICAL SOC  

    We have made a precise measurement of the absolute branching fractions of B-s(0) -&gt; D-s(()*()+) D-s(()*()-) decays using 121.4 fb(-1) of data recorded by the Belle experiment running at the Upsilon(5S) resonance. The results are B(B-s(0) -&gt; D-s(+) D-s(-)) = 0.58(-0.09)(+0.11) +/- 0.13)%, B(B-s(0) -&gt; D-s*(+/-) D-s(-/+)) = (1.76(-0.22)(+0.23) +/- 0.40)%, and B(B-s(0) -&gt; D-s*(+) D-s*(-)) = (1.98(-0.31-0.50)(+0.33+0.52))%; the sum is B(B-s(0) -&gt; D-s(()*()+) D-s(()*()-)) = (4.32(-0.39-1.03)(+0.42+1.04))%. Assuming B-s(0) -&gt; D-s(()*()+) D-s(()*()-) saturates decays to CP-even final states, the branching fraction constrains the ratio Delta Gamma(s)/cos phi(12), where Delta Gamma(s) is the difference in widths between the two B-s-(B) over bar (s) mass eigenstates, and phi(12) is the CP-violating phase in B-s-(B) over bar (s) mixing. We also measure for the first time the longitudinal polarization fraction of B-s(0) -&gt; D-s*(+) D-s*(-); the result is 0.06(-0.17)(+0.18) +/- 0.03. DOI: 10.1103/PhysRevD.87.031101

    DOI： 10.1103/PhysRevD.87.031101

    Web of Science

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  • Study of beam profile measurement at interaction point in international linear collider Reviewed

    Kazutoshi Ito, Akiya Miyamoto, Tadashi Nagamine, Toshiaki Tauchi, Hitoshi Yamamoto, Yosuke Takubo, Yutaro Sato

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT   608 ( 3 )   367 - 371   2009.9

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    Language：English   Publisher：ELSEVIER SCIENCE BV  

    At the international linear collider, measurement of the beam profile at the interaction point is a key issue to achieve high luminosity. We report a simulation study on a new beam profile monitor, called the pair monitor, which uses the hit distribution of the electron-positron pairs generated at the interaction point. We obtained measurement accuracies of 5.1%, 10.0%, and 4.0% for the horizontal (sigma(x)), vertical (sigma(y)), and longitudinal beam sizes (sigma(z)), respectively, for 50 bunch crossings. (C) 2009 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.nima.2009.07.027

    Web of Science

    CiNii Article

    arXiv

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    Other Link： http://arxiv.org/pdf/0901.4151v2

  • Beam Size Measurement with Pair Monitor and BeamCal

    Kazutoshi Ito, Akiya Miyamoto, Tadashi Nagamine, Yutaro Sato, Yosuke Takubo, Toshiaki Tauchi, Hitoshi Yamamoto

    2009.1

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    At the International Linear Collider (ILC), measurement of the beam profile
    at the interaction point (IP) is a key issue to achieve high luminosity. We
    studied the beam size measurement by combination of Pair Monitor and BeamCal.
    We obtained measurement accuracies of 2.7%, and 6.6% for the horizontal, and
    vertical beam sizes, respectively, for 50 bunch crossings.

    arXiv

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    Other Link： http://arxiv.org/pdf/0901.4446v2

  • Development of Pair Monitor

    Yosuke Takubo, Hirokazu Ikeda, Kazutoshi Ito, Akiya Miyamoto, Tadashi Nagamine, Rei Sasaki, Toshiaki Tauchi, Yutaro Sato, Hiroshi Yamamoto

    2009.1

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    The pair monitor is a beam profile monitor at interaction point (IP) for the
    international linear collider (ILC). We have designed and developed the pair
    monitor as a silicon pixel sensor which is located at about 400 cm from IP. As
    the first step to develop the pair monitor, the readout ASIC was developed. In
    this paper, test results of the readout ASIC and the future plan are reported.

    arXiv

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    Other Link： http://arxiv.org/pdf/0901.3429v1

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Research Projects

  • Probing New Physics with Tau-Lepton

    Grant number：26220706

    2014.5 - 2019.3

    System name：Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (S)

    Research category：Grant-in-Aid for Scientific Research (S)

    Awarding organization：Japan Society for the Promotion of Science

    IIJIMA Toru, HAYASHII Hisaki, AIHARA Hiroaki, MATSUOKA Kodai, SUZUKI Kazuhito, KATO Yuji, MAEDA Yosuke, SATO Yutaro

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    Grant amount：\194480000 （ Direct Cost: \149600000 、 Indirect Cost：\44880000 ）

    We have carried out particle physics research in order to search for New Physics beyond the Standard Model, focusing on tauonic B meson decays (B→D(*)τν) and lepton flavor violating tau-lepton decays (τ→μγ, τ→μμμetc.) at the SuperKEKB/Belle II experiment. We have completed construction of the novel particle identification detector "TOP counter", which has been developed by our own idea, and confirmed its performance. We also upgraded the computing system at Nagoya university so that we can produce large sample of simulation data efficiently and stably to prepare for the Belle II data analyses. Despite delay in the accelerator project, we could largely improved the analysis of the tauonic B-meson decays using the existing full data from the Belle experiment, and found indication of New Physics with 2.6 σ significance (3.8 σ when combined with results from other experiments in the world). The result acquired a lot of attention from particle physics community.

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  • Ｂｅｌｌｅ ＩＩ実験への新型粒子識別検出器ＴＯＰカウンターの導入による新物理探索

    Grant number：13J03438

    2013.4 - 2016.3

    System name：科学研究費助成事業 特別研究員奨励費

    Research category：特別研究員奨励費

    Awarding organization：日本学術振興会

    佐藤 優太郎

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    Grant amount：\3960000 （ Direct Cost: \3300000 、 Indirect Cost：\660000 ）

    昨年から引き続き、一般に公開されている理論計算プログラムコード”SuperIso” と自ら開発した統計処理のプログラムコードを用いて、標準理論を超えた新しい物理に対して、Belle II 実験の結果によってどれだけ探れるかを調べた。
    本年度ではとくに統計処理コードに改良を加え、実験観測量の間の誤差の相関と理論誤差をより適切に取り扱えるようにした。このことによって、標準理論からのずれの大きさをより正しく見積もることができるようになった。
    電弱ペンギン崩壊を用いたグローバルフィットに関する研究会を2016年11月に米国、Pacific Northwest National Laboratory にて開催した。わたしはSuperIso のチュートリアルの発表をし、他の理論計算プログラムコードである、EOS, HepFit, SusyFlavor の開発者と議論し、グループ間で意見交換できる関係を築くことに成功した。グループ間でコードにバグが無いかを相互に確認していくことで、フレーバー物理のための理論計算プログラムコードの開発が促進できると考えられる。
    グローバルフィットで使用してきた観測量の1 つであるB → D*τν 崩壊の崩壊分岐比をBelle のデータを用いて測定した。わたしが行った解析では従来の方法とは異なる手法を用いているため、過去の解析と同じデータを用いながら、統計的に独立にB → D*τν崩壊の崩壊分岐比を測定することができる。これまでの測定で標準理論からのずれが示唆されていたが、わたしの解析結果においても同様の傾向が見られている。この結果はコラボレータによってMoriond 2016 で初めて発表され、その後、わたしが物理学会において発表した。

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  • Belle実験 Υ(5S)におけるCP対称性の破れの角phi1の測定

    Grant number：10J03308

    2010 - 2012

    System name：科学研究費助成事業 特別研究員奨励費

    Research category：特別研究員奨励費

    Awarding organization：日本学術振興会

    佐藤 優太郎

    　 More details

    Grant amount：\2100000 （ Direct Cost: \2100000 ）

    本研究ではBelle実験で集められたY(5S)モードのデータを用いて、従来の測定方法とは異なる方法でCP対称性の破れの角sin2phi1測定することを目指した。昨年度までで、最も有用な崩壊モードを用いて解析を行い、結果を論文(Physical Review Letter)にまとめることができた。そのため、今年度は、bクォークがレプトン対を伴いながらsクォークに崩壊する事象のレプトン前後非対称度を測定して、標準理論超える新しい物理を探索した。sクォークを18個の終状態から再構成を行い、その内、レプトン前後非対称度の測定のために10個の終状態を用いた。レプトン対は電子陽電子対もしくはミューオン対から再構成した。本研究では信号事象と背景事象の分離のためにニューラルネットワークを導入して、従来の尤度比を用いた方法に比べて、より効率的に分離することに成功した。
    レプトン前後非対称度の測定ために約300信号事象を得て、結果として、レプトン対の不変質量の2乗の小さい領域では標準理論の予言と1.8σで無矛盾な結果を得た。この結果は標準理論を超える物理を制限するのに使うことができる。
    途中までの解析結果は研究代表者本人によって物理学会(2012年秋季大会,2012/09/11@京都産業大学)で発表され、最終結果は研究代表者本人によって物理学会(第68回年次大会,2013/03/27@広島大学)で発表された。

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Teaching Experience

  • 量子研究の最前線

    2023
    Institution name：新潟大学

  • 自然科学基礎実験

    2022
    Institution name：新潟大学

  • データサイエンス概論

    2022
    Institution name：新潟大学

  • 物理学基礎実習b

    2022
    Institution name：新潟大学

  • 物理学基礎実習a

    2022
    Institution name：新潟大学

  • 実験素粒子物理学II

    2022
    Institution name：新潟大学

  • 学問の扉 知と方法の最前線

    2022
    Institution name：新潟大学

  • 理学スタディ・スキルズ

    2022
    Institution name：新潟大学

  • 物理学実験A

    2021
    Institution name：新潟大学

  • 物理学実験B

    2021
    Institution name：新潟大学

  • 物理学実験C

    2021
    Institution name：新潟大学

  • 素粒子物理学

    2021
    Institution name：新潟大学

  • 現代物理学セミナーB

    2021
    Institution name：新潟大学

  • 現代物理学セミナーA

    2021
    Institution name：新潟大学

  • 物理学実験D

    2021
    -
    2022
    Institution name：新潟大学

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